I have no hot water coming from my water heater. The water is hot but does not flow through the lines. it has a one valve bypass kit installed by Winnebago at the factory. It has all plastic lines. Any suggestions?

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Do you have water pressure in the system? Cold water pressure? If you do then, if there is nothing to "push" the hot water out there will be no flow from the water heater, your rig may be equipped with a one way valve on the cold water inlet hose that has failed. These failures are quite common and the valve is usually less than $10.00 at Camping World.

The Winnebago water system is notorious for stuck check valves in the bypass system. The valves are where the tubing enters and leaves the heater. It is a very common problem if the RV is used in areas with hard water, which is a lot of the USA.Especially in rural campgrounds.

Opening the relief valve should be no different than opening a faucet - both relieve pressure. But if the check valve I mentioned previously is stuck closed, opening a faucet won't let water flow, while opening the relief on the tank itself will. My guess is that relieving the tank pressure let the check valve bounce back enough to free it up. If that's the case, it will almost surely stick again before too long.

You were right, the problem happened again. You say the check valve is in fiting where the hot water line leaves the tank?

Winnebago one valve systems use two check valves, one on the inlet and one on the outlet. Often they are screwed right into the water heater. They look like brass fittings and at first I didn't realize they were check valves.

Thank you for your input. I found the check valve at the water heater came apart. Removed it and all is good to go. I have been plagued with low pressure from the hot water. This also took care of that problem.